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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7b2d58b99679cd1d241cd9c8dbb4de4a9bbb8dc3e63add4a5768b2284fd7fd' 
  AND token = '0RRI1MfNA48L1i77dbR4/XjBNzmvcqkx0nFo7UQVE2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}